Air conditioner



FIG. 1 is a perspective view of an air conditioner, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrating portions of an air conditioner form no part of the claimed design. 

CLAIM The ornamental design for an air conditioner, as shown and described. 